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chromium/third_party/blink/web_tests/external/wpt/html/semantics/tabular-data/the-table-element/tFoot.html 

<!doctype html>
<meta charset="utf-8">
<title>tFoot tests</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<table id="t">
<caption id="tcaption"></caption><thead id="thead"></thead><tbody id="tbody1"></tbody><tbody id="tbody2"></tbody><tfoot id="tfoot1"></tfoot><tfoot id="tfoot2"></tfoot><tfoot id="tfoot3"></tfoot></table>
<script>
test(function() {
    var t = document.getElementById("t");
    var tfoot1 = document.getElementById("tfoot1");

    assert_equals(t.tFoot, tfoot1);

    var tfoot2 = document.getElementById("tfoot2");
    t.tFoot = null;

    assert_equals(t.tFoot, tfoot2);

    var tfoot3 = document.getElementById("tfoot3");
    t.deleteTFoot();

    assert_equals(t.tFoot, tfoot3);

    var tfoot = t.createTFoot();
    assert_equals(t.tFoot, tfoot);
    assert_equals(tfoot, tfoot3);

    t.deleteTFoot();
    assert_equals(t.tFoot, null);

    var tbody2 = document.getElementById("tbody2");

    tfoot = t.createTFoot();
    assert_equals(t.tFoot, tfoot);

    assert_equals(t.tFoot.previousSibling, tbody2);
    assert_equals(t.tFoot.nextSibling, null);

    t.deleteTFoot();
    assert_equals(t.tFoot, null);

    t.tFoot = tfoot;
    assert_equals(t.tFoot, tfoot);

    assert_equals(t.tFoot.previousSibling, tbody2);
    assert_equals(t.tFoot.nextSibling, null);

    assert_throws_js(TypeError, function(){
        t.tFoot = document.createElement("div");
    });

    assert_throws_dom("HierarchyRequestError", function(){
        t.tFoot = document.createElement("thead");
    });
})

test(function () {
    var table = document.createElementNS("http://www.w3.org/1999/xhtml", "foo:table")
    var tfoot = table.createTFoot();

    assert_equals(table.tFoot, tfoot);
    assert_equals(tfoot.prefix, null);
});
</script>